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Low frequency dielectric investigations of disordered trimethylammonium cations are presented and discussed. Ordering process of N(CH3)3H+ cations are described by means of an asymmetry of doubleminimum potential. Pyroelectric experiment on TMACA provided clear evidence of another continuous phase transition at 127 K…
New developments using artificial intelligence and the computer can effect changes in the production of apparel and ultimate consumer satisfaction with apparel products. Much data specification is needed before apparel can be manufactured that quickly and efficiently takes into account the individual body of the consu…
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Fission gas behavior of UO2 fuel pellets with controlled microstructure irradiated to 23 GWd/t in a test reactor has been studied by using a postirradiation annealing experiment. Four types of fuel pellets with or without additives were examined : (1) un-doped standard (grain size: 16/μm), (2) un-doped large grained (…
<div class="htmlview paragraph">The relationship between hydrogen gas and microporosity in magnesium alloy AZ91 was quantified, refuting the belief that hydrogen levels less than the maximum solid solubility are of no detriment. Sand castings were made from melts containing measured levels of hydrogen gas, and t…
Abstract The crystal structure of KBSi 3 O 8 (orthorhombic, Pnam , with a = 8.683(1), b = 9.253(1), c = 8.272(1) Å,, V = 664.4(1) Å 3 , Z = 4) has been determined by the direct method applied to 3- dimensional rcflection data. The structure of a microcrystal with the dimensions 20 × 29 × 37 μm was refined to an unweig…
Abstract The electric charge and surface characteristics of montmorillonite (Mt) complexed with hydroxy‐Al (HyA) or hydroxyaluminosilicate (HAS) ions were studied in the pH range of 4 to 8. The HAS or HyA ions were prepared from solutions containing HyA ions and orthosilicic acid at an Al concentration of 4 mmol L ‐1…
Abstract Mit einer Schmelzmitteltechnik wurde erstmals Ba 3 In 2 Zn 5 O 11 dargestellt und an Einkristallen röntgenographisch untersucht. Es kristallisiert kubisch, in der Raumgruppe T ‐F 4 3m, mit a = 13,3588 Å und Z = 8. Zn 2+ ist tetraedrisch von O 2− koordiniert und bildet Zn 10 O 20 ‐Makropolyeder. Ferner wird de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThird-order nonlinear optical response of some tetrasubstituted cumulenesIvan Kminek, Josef Klimovic, and Paras N. PrasadCite this: Chem. Mater. 1993, 5, 3, 357–360Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1…
A transient solution is derived for the reflected pressure along the axis of symmetry of a concave ellipsoidal mirror. The incident field is a spherical wave produced at the near focus of the mirror. It is assumed that the characteristic wavelengths are short in comparison with the minimum radius of curvature of the m…
High-resolution x-ray scattering and ac-calorimetric measurements have been carried out near the nematic--smectic-${\mathit{A}}_{1}$ phase transition of the pure liquid-crystal compound octyloxyphenylnitrobenzoyl- oxy benzoate (${\mathrm{DB}}_{8}$${\mathrm{ONO}}_{2}$). Several forms of the structure factor S(q) for fi…
This report describes the design and construction of apparatus to measure the specific heat capacity of solid materials in the temperature range IB-32°C. The apparatus is designed to minimize heat losses from the sample in order to measure the specific heat to an accuracy of better than :to.2% at the 95% confidence le…
Experimental results of very large, long-wavelength photocurrent gains in amorphous silicon-based Schottky barrier structures are reported. It is shown that these occur for devices in the space-charge current regime operated at forward bias voltages past the flatband condition. The analysis of microelectronic and phot…
ABSTRACf The results of electron-microprobe analyses of 38 samples of allanite from granitic rocks and calcite veins in the Grenville province of southeastem Ontario'and southwestem Quebec are presented. Allanite from granitic rocks show a w.ider rang e o!ffn contentsthanttrosefromcarbonateveins.Thesamplesofallanitest…
Abstract Crystallization of polymers plays an important role in polymer processing because the structure developed during crystallization influences the mechanical and physical properties of the polymer product. The crystallization of polymers takes place under nonisothermal crystallization is essential for optimizing…
Modern scanning electron microscopy yields structural information down to 2 to 5 nm from thin, beam transparent biological specimens. This paper examines the possibilities of garnering this level of structural information from bulk, frozen-hydrated samples. Freeze-fractured, frozen-hydrated yeast cells, frequently tak…
Abstract Due to the ever growing and more complex demands on the properties of polymer materials, raw material producers and plastic processing industries are more and more interested in the continuous synthesis and modification of polymers. In this article the production of polystyrene and styrene–isoprene copolymers…
Abstract We have investigated the effect of added Si0 2 on the photochemistry of anthracene, 1, in cyclohexane. Adsorption of 1 onto the Si0 2 surface from cyclohexane follows a Freundlich adsorption isotherm indicating interactions between 1 and the surface over a distribution of adsorption sites. In the absence of o…
Up-conversion emission spectra of fluorophosphate glasses doped with Tm3+ and co-doped with Tm3+ and Yb3+ ions were obtained under two different excitation wavelengths (657 and 683 nm). Both samples show a stronger emission centered at 450 nm than the ones centered at 478 and 363 nm when 3F2 level of Tm3+ is excited a…
Abstract The electrochemical oxidation of anodic cobalt, nickel, and zinc in acetonitrile containing both 2‐pyrrole‐[N‐( o ‐hydroxyphenyl)methylimines] (H 2 L) and a bidentate ligand (1, 10‐phenanthroline(phen) or 2,2′‐bipyridine(bipy)) yielded compounds of general formula M(HL) 2 · phen and M(HL) 2 · bipy (M = Co, Ni…